The Fluke TP40 Automotive Back Probe Pins, 4mm (Pack of 5) are flexible and formable 1 1/4 in. pins, which provide an easy connection past weather pack seals to connector conductors. Tested to over 60V DC, these pins are a must-have for fuel injectors, TPS and MAP sensors, as well as for any underhood or under vehicle connector. The bright yellow body stands out in an engine compartment to ensure they are not left behind. They easily connect to test leads that have removable ends.